Blue wave packs are a promotion that Topps runs. If you open THIS many hobby packs and send in the wrappers, they'll send you a pack of special cards not available anywhere else. Depending on the product, it is extremely popular and, as there are only so many available, can run out in a hurry.

Thanks for the information. I appreciate it! I have more questions, however.

So blue wave packs are just unique to Bowman Chrome each year?
One wrapper sent into Topps = one pack of special cards mailed to you?
How many cards per pack? Can autographs and cool cards be pulled?